/* ===================================================
   YABO体育 · 共享样式 /assets/site.css
   深球场绿底板 + 堆叠画板 + 框架式导航
   =================================================== */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; }
table { border-collapse: collapse; width: 100%; }
a { color: inherit; text-decoration: none; }

/* ---------- 2. Tokens ---------- */
:root {
  --pitch: #0B1F17;
  --panel: #123326;
  --cyan: #16E0C8;
  --cyan-deep: #0FA38F;
  --flare: #FF5A2B;
  --amber: #FFC24B;
  --paper: #F4F7F5;
  --steel: #C9D6D0;
  --mute: #7A8F87;
  --mist: #E8FFF9;

  --line: rgba(22, 224, 200, 0.22);
  --line-strong: rgba(22, 224, 200, 0.48);
  --line-soft: rgba(201, 214, 208, 0.12);
  --line-paper: rgba(11, 31, 23, 0.14);

  --font-head: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --rail-w: 96px;
  --bar-h: 62px;
  --wrap: 1360px;
  --gap: clamp(12px, 1.4vw, 22px);
  --pad: clamp(18px, 2.8vw, 40px);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. Base ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--steel);
  background-color: var(--pitch);
  background-image:
    radial-gradient(120% 62% at 10% -12%, rgba(22, 224, 200, 0.12), rgba(11, 31, 23, 0) 62%),
    radial-gradient(70% 48% at 102% 0%, rgba(255, 90, 43, 0.08), rgba(11, 31, 23, 0) 60%);
  background-repeat: no-repeat;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  color: var(--paper);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(30px, 3.4vw, 44px); }
h2 { font-size: clamp(22px, 2.1vw, 28px); }
h3 { font-size: clamp(17px, 1.5vw, 20px); }
h4 { font-size: 16px; }

::selection { background: var(--flare); color: #fff; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 2px; }

[id] { scroll-margin-top: calc(var(--bar-h) + 20px); }
#main-content { scroll-margin-top: calc(var(--bar-h) + 12px); }

/* ---------- 4. Utilities ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}
.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.label {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 8px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--cyan);
  border: 1px solid var(--line);
  background: rgba(22, 224, 200, 0.06);
}
.label--index { color: var(--amber); border-color: rgba(255, 194, 75, 0.35); background: rgba(255, 194, 75, 0.07); }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 300;
  padding: 10px 16px;
  background: var(--cyan); color: #04120D;
  font-weight: 700; font-size: 14px;
}
.skip-link:focus { left: 8px; top: 8px; }

/* ---------- 5. Buttons / chips / tags ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5em;
  padding: 11px 18px;
  font-family: var(--font-body); font-weight: 700; font-size: 14px; letter-spacing: 0.02em;
  border: 1px solid transparent; border-radius: 2px;
  cursor: pointer; text-align: center; white-space: nowrap;
  transition: background-color 0.24s var(--ease), color 0.24s var(--ease), border-color 0.24s var(--ease);
}
.btn--primary { background: var(--cyan-deep); color: #04120D; border-color: var(--cyan-deep); }
.btn--primary:hover { background: var(--cyan); border-color: var(--cyan); color: #04120D; }
.btn--ghost { background: transparent; color: var(--cyan); border-color: var(--line-strong); }
.btn--ghost:hover { background: rgba(22, 224, 200, 0.12); }
.btn--small { padding: 8px 13px; font-size: 13px; }

.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 8px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.12em; line-height: 1.5;
  border: 1px solid var(--line);
}
.tag--live { color: var(--flare); border-color: rgba(255, 90, 43, 0.5); background: rgba(255, 90, 43, 0.1); }
.tag--soon { color: var(--amber); border-color: rgba(255, 194, 75, 0.45); background: rgba(255, 194, 75, 0.08); }
.tag--done { color: var(--mute); border-color: rgba(201, 214, 208, 0.3); background: rgba(201, 214, 208, 0.06); }
.tag--data { color: var(--cyan); border-color: var(--line-strong); background: rgba(22, 224, 200, 0.08); }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 13px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em;
  color: var(--steel);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 2px; cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.chip:hover { color: var(--cyan); border-color: var(--line-strong); }
.chip[aria-pressed="true"],
.chip.is-active {
  color: var(--cyan);
  background: rgba(22, 224, 200, 0.14);
  border-color: var(--cyan);
  box-shadow: inset 0 0 0 1px rgba(22, 224, 200, 0.35);
}

.segmented { display: inline-flex; border: 1px solid var(--line); }
.segmented__btn {
  padding: 7px 14px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.08em;
  color: var(--mute); cursor: pointer;
  border-right: 1px solid var(--line);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.segmented__btn:last-child { border-right: 0; }
.segmented__btn:hover { color: var(--cyan); }
.segmented__btn[aria-pressed="true"] { color: var(--pitch); background: var(--cyan); }

/* ---------- 6. Header ---------- */
.site-header { position: relative; z-index: 90; }

.scroll-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 200;
  background: rgba(22, 224, 200, 0.08);
  pointer-events: none;
}
.scroll-progress__bar {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--cyan-deep), var(--cyan) 60%, var(--flare));
  transition: width 0.12s linear;
}

.index-bar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 120;
  height: var(--bar-h);
  background: rgba(8, 24, 18, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.index-bar__inner {
  height: 100%;
  display: flex; align-items: center; gap: clamp(10px, 1.6vw, 24px);
  padding-inline: clamp(12px, 2.2vw, 30px);
}

.brand { display: flex; align-items: center; gap: 11px; min-width: 0; }
.brand__mark {
  flex: none;
  display: grid; place-items: center;
  width: 34px; height: 34px;
  font-family: var(--font-mono); font-weight: 700; font-size: 17px;
  color: #04120D;
  background: linear-gradient(140deg, var(--cyan), var(--cyan-deep));
  border: 1px solid var(--cyan);
}
.brand__text { display: flex; flex-direction: column; min-width: 0; }
.brand__name { font-weight: 800; font-size: 16px; color: var(--paper); letter-spacing: 0.02em; line-height: 1.3; }
.brand__line {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; color: var(--mute);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.index-bar__meta { display: flex; align-items: center; gap: 10px; min-width: 0; }
.phase-strip { display: flex; gap: 6px; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.12em; }
.phase-chip { padding: 4px 9px; color: var(--mute); border: 1px solid rgba(22, 224, 200, 0.2); }
.phase-chip--live { color: var(--flare); border-color: rgba(255, 90, 43, 0.5); background: rgba(255, 90, 43, 0.1); }

.index-bar__cta { margin-left: auto; }

.nav-toggle {
  position: relative; flex: none;
  display: grid; place-items: center;
  width: 42px; height: 38px;
  border: 1px solid var(--line-strong);
  cursor: pointer;
}
.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  position: absolute; left: 50%; width: 18px; height: 2px;
  background: var(--cyan);
  transition: transform 0.24s var(--ease), top 0.24s var(--ease), background-color 0.24s var(--ease);
}
.nav-toggle__bars { top: 50%; margin-top: -1px; transform: translateX(-50%); }
.nav-toggle__bars::before { content: ""; top: -6px; transform: translateX(-50%); }
.nav-toggle__bars::after { content: ""; top: 6px; transform: translateX(-50%); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: translateX(-50%) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: translateX(-50%) rotate(-45deg); }

/* 移动优先：框架导航折叠为下拉面板 */
.site-nav {
  position: fixed; top: var(--bar-h); left: 0; right: 0; z-index: 110;
  background: #0A1912;
  border-bottom: 1px solid var(--line);
  max-height: 0; overflow: hidden; visibility: hidden;
  transition: max-height 0.34s var(--ease), visibility 0.34s var(--ease);
}
.site-nav[data-open] { max-height: min(78vh, 560px); overflow: auto; visibility: visible; }
.site-nav__list { display: flex; flex-direction: column; padding: 6px 0; }
.site-nav__link {
  display: block;
  padding: 14px clamp(16px, 5vw, 30px);
  font-weight: 700; font-size: 15px; color: var(--steel);
  border-bottom: 1px solid var(--line-soft);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.site-nav__link:hover { color: var(--cyan); background: rgba(22, 224, 200, 0.07); }
.site-nav__link[aria-current="page"] {
  color: var(--cyan);
  background: rgba(22, 224, 200, 0.1);
  box-shadow: inset 3px 0 0 var(--cyan);
}
.site-nav__note { display: none; }

/* ---------- 7. Layout ---------- */
main { display: block; padding-top: var(--bar-h); }

.wrap {
  width: min(100%, var(--wrap));
  margin-inline: auto;
  padding-inline: clamp(16px, 3vw, 40px);
}

.grid { display: grid; gap: var(--gap); grid-template-columns: repeat(12, minmax(0, 1fr)); }
.span-2 { grid-column: span 2; }
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-10 { grid-column: span 10; }
.span-12 { grid-column: span 12; }

/* ---------- 8. Panel（堆叠画板） ---------- */
.panel {
  position: relative;
  margin-block: clamp(52px, 8vw, 110px);
  padding: calc(var(--pad) + 10px) var(--pad) var(--pad);
  background:
    linear-gradient(180deg, rgba(22, 224, 200, 0.05), rgba(11, 31, 23, 0) 160px),
    var(--panel);
  border: 1px solid var(--line);
  box-shadow: 0 30px 70px -50px rgba(0, 0, 0, 0.95);
}
.panel::before,
.panel::after {
  content: ""; position: absolute; width: 14px; height: 14px;
  border: 1px solid var(--cyan); pointer-events: none;
}
.panel::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.panel::after { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

.panel__tag {
  position: absolute; top: -1px; left: var(--pad);
  transform: translateY(-50%);
  display: inline-flex; align-items: center; gap: 0.5em;
  padding: 5px 10px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--pitch); background: var(--cyan);
  border: 1px solid var(--cyan);
}
.panel__head {
  display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between;
  gap: 14px; margin-bottom: clamp(16px, 2vw, 28px);
}
.panel__title { max-width: 24ch; }
.panel__lead { max-width: 62ch; color: var(--steel); font-size: 15px; }
.panel__body { display: grid; gap: var(--gap); }

.panel--paper {
  background: var(--paper);
  color: #26443A;
  border-color: var(--line-paper);
  box-shadow: 0 30px 60px -48px rgba(0, 0, 0, 0.9);
}
.panel--paper::before, .panel--paper::after { border-color: rgba(11, 31, 23, 0.4); }
.panel--paper h1, .panel--paper h2, .panel--paper h3, .panel--paper h4 { color: #0B1F17; }
.panel--paper .panel__lead { color: #3E5A50; }
.panel--paper .panel__tag { color: var(--cyan); background: #0B1F17; border-color: #0B1F17; }

/* ---------- 9. Cards ---------- */
.card {
  position: relative;
  display: flex; flex-direction: column; gap: 10px;
  padding: clamp(14px, 1.4vw, 20px);
  background: rgba(244, 247, 245, 0.03);
  border: 1px solid rgba(22, 224, 200, 0.16);
  border-radius: 2px;
  transition: border-color 0.24s var(--ease), background-color 0.24s var(--ease), transform 0.24s var(--ease);
}
.card:hover { border-color: var(--line-strong); background: rgba(22, 224, 200, 0.05); transform: translateY(-2px); }
.card__tag { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; color: var(--mute); text-transform: uppercase; }
.card__title { font-size: 17px; color: var(--paper); }
.card__meta { font-family: var(--font-mono); font-size: 12px; color: var(--mute); }
.card__foot {
  margin-top: auto; padding-top: 10px;
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  border-top: 1px dashed rgba(22, 224, 200, 0.18);
}
.card--fixture { padding: 12px 14px; gap: 8px; }
.card--stat {
  background: linear-gradient(180deg, rgba(22, 224, 200, 0.08), rgba(11, 31, 23, 0) 90%);
  border-color: rgba(22, 224, 200, 0.24);
}
.card--score {
  gap: 18px;
  padding: clamp(20px, 2.4vw, 34px);
  border-color: var(--line-strong);
  background:
    radial-gradient(120% 96% at 0% 0%, rgba(255, 90, 43, 0.18), rgba(11, 31, 23, 0) 58%),
    linear-gradient(158deg, #16453A 0%, #0E2A21 58%, #0B1F17 100%);
}

.score-board { display: flex; align-items: center; gap: clamp(10px, 2vw, 26px); }
.score-board__team { flex: 1 1 0; min-width: 0; }
.score-board__name { font-size: clamp(15px, 1.3vw, 18px); font-weight: 700; color: var(--paper); }
.score-board__sub { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; color: var(--mute); }
.score-board__num {
  font-family: var(--font-mono); font-weight: 700;
  font-size: clamp(56px, 8.4vw, 132px);
  line-height: 0.9; letter-spacing: -0.04em;
  color: var(--paper); font-variant-numeric: tabular-nums;
}
.score-board__num--hot { color: var(--flare); }
.score-board__vs { font-family: var(--font-mono); font-size: clamp(14px, 1.4vw, 20px); color: var(--cyan); }
.score-board__clock { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.08em; color: var(--amber); }

/* ---------- 10. Table ---------- */
.table-wrap { overflow-x: auto; border: 1px solid rgba(22, 224, 200, 0.16); }
.data-table { min-width: 620px; font-size: 14px; }
.data-table caption {
  caption-side: top; text-align: left;
  padding: 10px 14px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; color: var(--mute);
}
.data-table th {
  padding: 10px 14px;
  text-align: left; white-space: nowrap;
  font-family: var(--font-mono); font-size: 12px; font-weight: 500; letter-spacing: 0.08em;
  color: var(--cyan); background: var(--panel);
  border-bottom: 1px solid rgba(22, 224, 200, 0.25);
}
.data-table td { padding: 10px 14px; color: var(--steel); border-bottom: 1px solid var(--line-soft); }
.data-table tbody tr:hover td { background: rgba(22, 224, 200, 0.05); }
.data-table__num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; color: var(--paper); }
.data-table__hot { color: var(--flare); font-weight: 700; }
.data-table th[data-sort] { cursor: pointer; user-select: none; }
.data-table th[data-sort]::after { content: "↕"; margin-left: 6px; color: var(--mute); }
.data-table th[aria-sort="ascending"]::after { content: "↑"; color: var(--cyan); }
.data-table th[aria-sort="descending"]::after { content: "↓"; color: var(--cyan); }

.panel--paper .data-table th { color: var(--cyan); background: #0B1F17; }
.panel--paper .data-table td { color: #33544A; border-bottom-color: rgba(11, 31, 23, 0.1); }
.panel--paper .data-table__num { color: #0B1F17; }

/* ---------- 11. Fold ---------- */
.fold { border: 1px solid rgba(22, 224, 200, 0.2); background: rgba(244, 247, 245, 0.02); border-radius: 2px; }
.fold + .fold { margin-top: 10px; }
.fold[open] { border-color: var(--line-strong); }
.fold__summary {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 14px 16px;
  font-weight: 700; color: var(--paper); cursor: pointer;
  list-style: none;
}
.fold__summary::-webkit-details-marker { display: none; }
.fold__icon {
  flex: none;
  font-family: var(--font-mono); font-size: 16px; color: var(--amber);
  transition: transform 0.24s var(--ease);
}
.fold[open] .fold__icon { transform: rotate(45deg); }
.fold__body { padding: 0 16px 16px; font-size: 15px; color: var(--steel); }

.panel--paper .fold { border-color: var(--line-paper); background: #fff; }
.panel--paper .fold__summary { color: #0B1F17; }
.panel--paper .fold__body { color: #33544A; }

/* ---------- 12. Figure（图片容器基础规则） ---------- */
.figure { display: flex; flex-direction: column; gap: 10px; }
.figure__frame {
  position: relative; overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(22, 224, 200, 0.14), rgba(11, 31, 23, 0.92)),
    repeating-linear-gradient(90deg, rgba(22, 224, 200, 0.1) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(0deg, rgba(22, 224, 200, 0.1) 0 1px, transparent 1px 44px),
    #10302A;
}
.figure__frame img { width: 100%; height: 100%; object-fit: cover; }
.figure--wide .figure__frame { aspect-ratio: 21 / 9; }
.figure--tall .figure__frame { aspect-ratio: 3 / 4; }
.figure--square .figure__frame { aspect-ratio: 1 / 1; }
.figure__cap { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; color: var(--mute); }

/* ---------- 13. Prose / Breadcrumbs / TOC ---------- */
.prose { max-width: 72ch; }
.prose > * + * { margin-top: 1em; }
.prose h2 { margin-top: 1.6em; }
.prose h3 { margin-top: 1.4em; }
.prose ul { display: grid; gap: 0.5em; }
.prose li { position: relative; padding-left: 1.2em; }
.prose li::before {
  content: ""; position: absolute; left: 0; top: 0.72em;
  width: 6px; height: 6px; background: var(--cyan); transform: rotate(45deg);
}
.prose strong { color: var(--paper); }
.prose a { color: var(--cyan); border-bottom: 1px solid var(--line-strong); }
.panel--paper .prose { color: #2C4B41; }
.panel--paper .prose strong { color: #0B1F17; }
.panel--paper .prose a { color: #0A6E60; border-bottom-color: rgba(10, 110, 96, 0.4); }

.breadcrumbs {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  margin-bottom: 16px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; color: var(--mute);
}
.breadcrumbs__link { color: var(--steel); }
.breadcrumbs__link:hover { color: var(--cyan); }
.breadcrumbs__sep { color: rgba(122, 143, 135, 0.6); }

.toc__list { display: grid; gap: 2px; }
.toc__link {
  display: block;
  padding: 8px 12px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.04em;
  color: var(--mute);
  border-left: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.toc__link:hover { color: var(--cyan); }
.toc__link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(22, 224, 200, 0.08);
}

/* ---------- 14. Copy ---------- */
.copy-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 10px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em;
  color: var(--cyan);
  border: 1px solid var(--line); border-radius: 2px; cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}
.copy-btn:hover { background: rgba(22, 224, 200, 0.12); }
.copy-hint { display: inline-block; min-height: 1em; font-family: var(--font-mono); font-size: 11px; color: var(--amber); }

/* ---------- 15. Motion & Back-to-top ---------- */
[data-reveal] {
  opacity: 0; transform: translateY(16px);
  transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
}
[data-reveal].is-in { opacity: 1; transform: none; }

.back-to-top {
  position: fixed; right: clamp(14px, 2vw, 28px); bottom: clamp(14px, 2vw, 28px); z-index: 130;
  width: 46px; height: 46px;
  display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 16px;
  color: var(--cyan); background: var(--panel);
  border: 1px solid var(--line-strong); border-radius: 2px;
  cursor: pointer;
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease), visibility 0.24s var(--ease), background-color 0.24s var(--ease), color 0.24s var(--ease);
}
.back-to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.back-to-top:hover { background: var(--cyan); color: var(--pitch); }

/* ---------- 16. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 10vw, 140px);
  padding-top: clamp(34px, 5vw, 64px);
  background: linear-gradient(180deg, #0A1912, #07120E);
  border-top: 1px solid var(--line);
}
.footer__inner {
  width: min(100%, var(--wrap));
  margin-inline: auto;
  padding: 0 clamp(16px, 3vw, 40px) clamp(28px, 4vw, 48px);
}
.footer__head {
  display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 12px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line-soft);
}
.footer__brand { font-size: clamp(18px, 1.8vw, 22px); font-weight: 800; color: var(--paper); letter-spacing: 0.02em; }
.footer__brandline { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.08em; color: var(--mute); }
.footer__cols {
  display: grid; gap: clamp(20px, 3vw, 40px);
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: clamp(24px, 3vw, 36px) 0;
}
.footer__col { min-width: 0; }
.footer__col-title {
  margin-bottom: 12px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--cyan);
}
.footer__list { display: grid; gap: 9px; }
.footer__link { display: inline-block; font-size: 14px; color: var(--steel); transition: color 0.2s var(--ease); }
.footer__link:hover { color: var(--cyan); }
.footer__meta { display: grid; gap: 10px; padding-top: 22px; border-top: 1px solid var(--line-soft); }
.footer__contact { font-family: var(--font-mono); font-size: 12px; line-height: 1.9; color: var(--steel); }
.footer__note { font-size: 13px; color: var(--mute); max-width: 70ch; }
.footer__legal { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; color: var(--mute); }

/* ---------- 17. Responsive ---------- */
@media (max-width: 1023px) {
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-2 { grid-column: span 3; }
  .span-3 { grid-column: span 3; }
  .span-4, .span-5, .span-6, .span-7, .span-8, .span-9, .span-10, .span-12 { grid-column: span 6; }
  .index-bar__meta { display: none; }
  .nav-toggle { display: grid; margin-left: auto; }
  .index-bar__cta { margin-left: 0; }
}

@media (max-width: 639px) {
  :root { --bar-h: 58px; }
  .grid { grid-template-columns: 1fr; }
  [class*="span-"] { grid-column: span 1; }
  .brand__line { display: none; }
  .index-bar__cta { display: none; }
  .footer__cols { grid-template-columns: 1fr; }
  .score-board { flex-wrap: wrap; }
  .score-board__num { font-size: clamp(52px, 16vw, 86px); }
}

@media (min-width: 1024px) {
  .nav-toggle { display: none; }

  .index-bar { left: var(--rail-w); }

  main { padding-left: var(--rail-w); }

  .site-nav {
    position: fixed; top: 0; left: 0; bottom: 0; right: auto;
    width: var(--rail-w);
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px;
    padding: 82px 0 26px;
    max-height: none; visibility: visible; overflow-y: auto;
    background: linear-gradient(180deg, #0C231B, #081712);
    border-right: 1px solid var(--line);
    border-bottom: 0;
  }
  .site-nav__list { flex-direction: column; align-items: center; gap: 16px; padding: 0; }
  .site-nav__link {
    writing-mode: vertical-rl;
    padding: 12px 8px;
    font-size: 14px; letter-spacing: 0.22em; line-height: 1;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }
  .site-nav__link[aria-current="page"] {
    box-shadow: none;
    background: rgba(22, 224, 200, 0.1);
    border-left-color: var(--cyan);
    color: var(--cyan);
  }
  .site-nav__note {
    display: block;
    writing-mode: vertical-rl;
    font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.24em;
    color: var(--mute);
  }

  .site-footer { padding-left: var(--rail-w); }
}

/* ---------- 18. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .scroll-progress__bar { transition: none; }
  html { scroll-behavior: auto !important; }
}